Remove old site.xml, replace with just a category definition.

Removed all old versions.
category.xml defines the fabeclipse category and can be used to
categorise the feature during export->deployable features, usin as
target this project.
Fix digit count for number ruler.

The number of digits was compted on a zero-based index, while
the number ruler is one-based.
Add tooltip and dialog title text to the color chooser.
Correct version in textedgrep dependency
New Text Editor Grep version. Added large file editor.